SFMTA and SFCTA efforts to improve walking and biking infrastructure aim to enhance safety, public health, and transportation options as the City plans for 82,000 new homes. Quick-build and Slow Streets interventions achieved substantial collision reductions at low cost: a Fell Street protected lane cut collisions 40% for $425,000, quick-build streets saw a 16% decline overall, and Slow Streets produced a 48% drop. Larger protected bike lane projects have encountered inconsistent delivery, with examples showing combined cost estimates of $33–$82 million for under two miles, lengthy community engagement, complex engineering, and multi-agency approvals causing multi-year delays.
"The City's " quick-build" and Slow Streets programs have been especially cost-effective, according to city studies. A quick-build protected bike lane on the Panhandle segment of Fell Street reduced traffic collisions by 40 percent at a cost of only $425,000. On the 28 streets getting quick-build treatment overall, collisions fell by 16 percent. Traffic collisions fell 48 percent on Slow Streets."
"At Embarcadero, the City's proposed protected bike lane extension aims to improve conditions on a popular half-mile segment. However, complex engineering and a plodding planning process have mired the project since 2014; five years alone were spent on community engagement, with SFMTA's project webpage boasting holding "dozens of in-person meetings with key stakeholders." These factors contribute to projected costs of $8 million to $12 million and a timeline extending to 2028."
Read at Streetsblog
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